Sources |
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- [S164] King John and the Road to Magna Carta, Stephen Church, (New York: Basic Books, 2015), 85-94, quoting 87-8.
- [S336429] Britain's Royal Families: A Complete Genealogy, Alison Weir, (London: Vintage Books, 2008), 69-72.
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- [S154] The Demon's Brood: A History of the Plantagenet Dynasty, Desmond Seward, (New York: Pegasus Books, 2014), 46.
- [S421] The Greatest Knight: The Remarkable Life of William Marshal, the Power Behind Five English Thrones, Thomas Asbridge, (New York: HarperCollins, 2014), 272.
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